i think you know, avoid camels is probably a good piece of advice. avoid the milk and meat, that may not sound good, but is pretty popular in parts of the world. if you are in that part of the world, and get sick get it checked out. this may not be something that just develops on a plane. it could be more serious if you have been in that part of the world. >> all right, dr. sanjay gupta, thank you. >> you got it, anderson, thank you. up next, witnesses to the massacre at kent state back in 1970, now working to preserve accurate historical information that led up to the shootings of the four by the ohio national guard. we'll be right back with more. dave, it's been a while.